After installation, you can add or remove Revit content using the Add or Remove Features utility.
Windows: On the Windows Control Panel, click Add or Remove Programs, select the Revit application from the Currently Installed Programs list, and click Change/Remove.
Windows Vista/7: From the Start menu, select Control PanelPrograms
Programs and Features
Uninstall or change a program, select the Revit application, and click Uninstall/Change.